Arrays 3 : Instance Methods pop() push() shift() unshift() slice() splice() indexOf() lastIndexOf() includes()

 /*
Instance Methods
*/

pop() push() shift() unshift() slice() splice() indexOf() lastIndexOf() includes()

// Display all bun types with " or " - use join()

// We have a string "hot dogs,hamburgers,sausages,corn" - use split() to turn it into a string

const foodString = "hot dogs,hamburgers,sausages,corn";

// console.log(foodString.split(','));

// console.log([...foodString]);

// console.log(foodString.split(''));

// console.log([...foodString]);

// These two work the same, it's because you're splitting with nothing.

// take the last item off toppings with pop()

const lastItem = toppings.pop();

// console.log(lastItem);

// add it back with push()

const t2 = toppings.push(lastItem);

// console.log(t2);

// take the first item off toppings with shift()

const firstItem = toppings.shift();

// console.log(firstItem);

// add it back in with unshift()

const t3 = toppings.unshift(firstItem);

// console.log(t3);

// Do the last four,but immutable (with spreads and new variables)

let newToppings = toppings.slice(0, toppings.length - 1);

newToppings = [...newToppings, toppings[toppings.length - 1]];

// console.log(newToppings);

newToppings = toppings.slice(1, toppings.length - 1);

newToppings = ['Mushrooms', ...newToppings];

// console.log(newToppings);

// Make a copy of the toppings array with slice()

const toppingsCopy = toppings.slice(0) // end is optional

// console.log(toppingsCopy);

// Make a copy of the toppings array with a spread

const toppingsCopy2 = [...toppings] // end is optional

// console.log(toppingsCopy2);

// take out items 3 to 5 of your new toppings array with splice()

// console.log(newToppings);

newToppings = newToppings.splice(2, 3);

// console.log(newToppings);

// find the index of Avocado with indexOf() / lastIndexOf()

const avoIndex = toppings.indexOf('Avocado');

// console.log(avoIndex);

const avoIndex2 = toppings.lastIndexOf('Avocado');

// console.log(avoIndex2);

// Check if hot sauce is in the toppings with includes()

const isInToppings = toppings.includes('Hot Sauce');

// console.log(isInToppings);

// add it if it's not

if (!isInToppings) {

toppings.push('Hot Sauce')

}

// console.log(toppings);

// flip those toppings around with reverse()

toppings.reverse();

// console.log(toppings);